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It's just too damn far. One of the things that fascinates me about the universe is how long it would take to get to another galaxy. The nearest spiral galaxy is what...2.5 million light years away? Whenever I think about how far light could travel in 2.5 million years it blows my mind. If there are "aliens" that have been here or are here, I have to think it's some kind of interdimensional visitor and not some intergalactic visitor.
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